I feel like the fact they paid the same party that investigated them is an obvious enough conflict of interest to dismiss this out of hand. Whether the report is actually trustworthy or not, there is an incentive to come to a conclusion that aligns with whomever paid them and that alone should make people question the conclusions being made.

If your leg has a mass of 2kg, 1.1×10^10 J of kinetic energy would require your leg to be moving at about 150 100 km/second not faster than the speed of light.

TLDR: Their math is shit.

Fanfiction isn’t a monolithic homogenous entity. Some of the most entertaining, well written stories that expand on their respective narrative universe are works of fan fiction but there are also poorly written abominations that cause psychic damage just being read.

No… that should result in them being fired.